FREQUENCY DOMAIN ECHO AND NEXT CANCELLATION

• US 20130142030A1
• Filed: 01/28/2013
• Published: 06/06/2013
• Est. Priority Date: 04/28/2003
• Status: Active Grant

• Current Assignee: Marvell International Limited (Marvell Technology Group Limited)
• Original Assignee: Marvell International Limited (Marvell Technology Group Limited)
• Inventors: Parnaby, Gavin D., Zimmerman, George A., Pagnanelli, Chris, Jones, William W.
• Granted Patent: US 8,743,674 B2
• Time in Patent Office: Days
• US Class Current: 370/201
• CPC Class Codes: H04B 3/23 using a replica of transmitted signal in the time domain, e.g. echo cancellers
• CPC Class Codes: H04B 3/32 Reducing cross-talk, e.g. by compensating
• CPC Class Codes: H04J 1/12 Arrangements for reducing cross-talk between channels in line transmission systems H04B3/32; in cables or lines H04B3/26 - H04B3/30

Abstract

A cancellation system is disclosed for processing incoming and outgoing signals in a transform domain to create a cancellation signal for reducing or removing unwanted interference. Data is ordered based on Good-Thomas indexing into a two dimensional array in a buffer. The two dimensional array may have l_r rows and l_w columns. From the buffer, the columns of data undergo a Winograd small transform. The rows of data undergo a Cooley-Tukey operation to complete the transform operation into the frequency domain. Multipliers scale the transformed data to generate a cancellation signal in the frequency domain. Inverse (Cooley-Tukey) and Winograd transforms perform inverse processing on the cancellation signal to return the cancellation signal or data to the time domain. Re-ordering the data and combination of the cancellation signal or data with incoming or outgoing signals achieve interference cancellation.

Claims

1. A method for reducing interference in an incoming signal received at a transceiver of a multi-channel communication device comprising:

receiving, in a serial format, a signal to be transmitted over a channel, the transmitted signal to be transmitted from the transceiver;

converting the signal to a parallel format to create data representing the signal;

performing ordering on the data based on Good-Thomas ordering;

performing a Winograd transform on the data and then a Cooley-Tukey transform to create transform domain data;

distributing the transform domain data to one or more multipliers;

multiplying the transform domain data by one or more weighting variables to create a weighted transform domain signal;

performing an inverse Cooley Tukey transform on the weighted transform domain data and then a inverse Winograd transform on the output of the inverse Cooley-Tukey transform to create cancellation data;

performing inverse ordering on the cancellation data;

converting the cancellation data to a serial format signal; and

combining the cancellation signal with the incoming signal to reduce interference in the incoming signal.